In-solenoid chip for undertaking plural functions

Internal-combustion engines – Starting device – For airplane

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307 103, 307 106, B60R 2504, F02N 1108

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active

061162019

ABSTRACT:
A vehicle antitheft system includes a MOSFET with associated power and logic circuitry embodied by a chip that can be housed within a starter solenoid housing for preventing control current from activating the solenoid unless an authorized enable signal is received. The enable signal can be transmitted by a hand-held rf transmitter. The chip can also undertake additional functions. In alternate embodiments, the MOSFET can be disposed in a housing separate from the solenoid and mounted near the solenoid, and the MOSFET can be controlled by an rf-generated enable signal or by an impulse-generated enable signal. In the latter case, the MOSFET is activated to close the solenoid control current circuit path only when a single impulse signal, e.g., from a door latch lock, is activated. If two impulse signals are received, one from, e.g., the door latch lock and another from, e.g., a locking mechanism/switch inside the vehicle, the MOSFET is not activated, to prevent a thief from actuating the system by breaking into the vehicle and unlocking the vehicle door from inside the vehicle.

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